Loch Sunart is a sea loch on the west coast of Scotland. Loch Sunart is bounded to the north by the Sunart district of Ardnamurchan and to the south by the Morvern district. At 31 kilometres (19 mi) long, it is the longest sea loch in the Highland local government area. The maximum depth of the loch is 124 metres, east of Càrna and near the entrance to Loch Teacuis. Other islands in the loch include Oronsay, seaward of Càrna, Risga, which lies between the two larger islands, and Eilean Mòr, which lies towards the landward end of the loch in line with Beinn Resipol.

Morvern, historically also spelt Morven, is a peninsula and traditional district in the Highlands, on the west coast of Scotland. It lies south of the districts of Ardgour and Sunart, and is bounded on the north by Loch Sunart and Glen Tarbert, on the south east by Loch Linnhe and on the south west by the Sound of Mull. The highest point is the summit of the Corbett Creach Bheinn which reaches 853 metres (2,799 ft) in elevation.